Tool retainer



G. cf PEARSON [TOOL RETAINER Aug. 7, 1934.

,Filed March 14, 1929 2 Sheets-Sheet 1 Gzafav CPea/vvrc 2 Sheets-Sheet 2 Aug. 7, 1934. e. c. PEARSON TOOL RETAINER Filed March 14, 1929 ff M 3W p m a g U /I w a Patented Aug. 7, 1934 r001. RETAINER Gustav C. Pearson, Denver, 0010., assignor to Gardner-Denver Company, Denver, 0010., a corporation of Delaware Application March 14, 1929, Serial No. 347,125-

7 Claims.

The object of the present invention is to provide a novel structure, by means of which strain brought upon the retaining member and the resistance to such strain lies longitudinally of and in the same plane as the tool.

In the accompanying drawings:

Figure 1 is a plan view of the preferred form of structure.

Figure 2 is a vertical side elevation with a por- IO tion in section.

Figure 3 is a front elevation.

Figure i is a sectional view on the line 4-4 of Figure 1.

Figure 5 is a perspective view of the saddle member.

Figure 6 is a detail sectional view on the line 66 of Figure 4.

In the embodiment disclosed, a tool holder 7 is provided that may be of any suitable form,

0" and is secured as usual to a drill or other implement by side bolts 8. It is provided with a socket 9 to receive the shank end 10 of a drill steel or other tool.

The holder '7 is provided at its front end and at one side of the'socket 9 with a transverse opening 11, in which is journaled a rock shaft 12 that projects beyond opposite sides of the holder, the projecting ends having transverse openings 13 therethrough. A retainer-carrying saddle is employed that embraces the front end of the tool holder. This saddle includes an arch bar 14 and side arms 15, the latter passing through the openings 13 of the rock shaft 12 and being pinned therein, as illustrated at 16. The side arms are provided with transversely disposed forwardly extending heads 17 in which are formed sockets 18. Openings 19 extend from the front ends of the sockets through the front ends of the heads.

A tool retaining yoke 20 that is located in ad- Vance of the tool holder is provided with rear- Wardly extending side arms 21 that pass through the openings 19 and the sockets 18. In the sockets and surrounding the arms are springs 22 that are borne against by plunger collars 23 on the rear ends of the arms, these plunger collars being held in place by nuts 24.. The rearward movements of the arms in their mountings are limited by stop flanges 25 carried thereby and 5 abutting the front ends of the heads 17. It will be noted that the yoke arms 21 are parallel to and in the same plane as the tool receiving socket 9, and consequently with the tool 10 placed therein. It will be understood that the tool is provided with the usual collar 26, in front of which the yoke 20 is adapted to be placed, as illustrated in Figure 3. p i H When the yoke isin such position the arch bar 14 is seated in a recess-2'1 formed on the rear side of an outstanding abutment lug 28 formed upon the tool holder '7 and located on the diametrically opposite side to the rock shaft 12. The yoke may be swung from its operative position to an inactive position, as indicated in dotted lines in Figure 2. To hold it in either position the mechanism shown in Figure 6 is preferably employed. The tool holder is provided in rear of the rock shaft 12 with an enlargement 29, in which is formed a chamber 30. In this chamber is a slidable plunger 31 having a rearwardly extending stem 32. Surrounding the stem 32 is a coiled spring 33 that bears against the rear side of the plunger 31 and urges it toward the rock shaft 12. Interposed between the plunger 31 and the rock shaft and having pivotal seatings in both is a toggle link 34. When the retaining yoke is in its active position the toggle link is in substantially the position indicated in Figure 6, and the spring 33 acting against the plunger 31 will thus serve to urge the rock shaft 12 forwardly, thereby holding the stirrup against the lug 28 and maintaining the yoke 20 in the position illustrated in the drawings. When the yoke is turned to one side the rock shaft 12 is also turned and the toggle shifted to an oppositely inclined position, so that the spring 33 now urges the parts in a direction to hold the yoke in the dotted line position of Figure 2.

From the foregoing, it is thought that the construction, operation and many advantages of the herein described invention will be apparent to those skilled in the art without further description and it will be understood that various changes in the size, shape, proportion and minor details of construction may be resorted to without departing from the spirit or sacrificing any of the advantages of the invention.

What I claim, is:

1. The combination with a tool holder having a socket for the reception of a tool shank, of a saddle pivoted to and embracing the holder, and a tool retaining yoke yieldingly mounted on the saddle.

2. The combination with a tool holder having a socket for the reception of a tool shank, of a saddle embracing the holder and having side arms pivotally mounted thereon, said saddle having a transverse socket, and a tool-retaining yoke having a portion yieldingly mounted in the 11 latter socket and extending in advance of the holder.

3. The combination with a tool holder having a socket for the reception of a tool shank, of a saddle embracing the holder and having side arms pivotally mounted thereon, said saddle having a transverse socket, an arm slidably mounted in the latter socket and extending: transversely of the saddle and longitudinally of the holder, and a tool-retaining yoke mounted on the arm in advance of the holder.

4. The combination with a tool holder having a socket for the reception of a tool shankfof a saddle embracing the holder and having side arms pivotally mounted thereon, said arms hav-' ing heads provided with transverse sockets, a tool retaining yoke in advance of the holder and having rearwardly extending arms slidable in the sockets, and springs resisting the forward sliding movements of the arms. :5 The combination-with a tool holder having a socket for the reception of a tool shank, of a rock shaft-journaled in the holder at one side of the socket, a saddle embracing the holder'and having side arms mounted on the shaft to turn therewith, said side arms having transversely disposed heads and sockets in the heads, a tool retaining yoke in advance of the holder and having rearwardly extending arms slidable in the sockets, and springs resisting the forward sliding movements of the arms.

6. The combination with a tool holder having a socket for the reception of a tool shank, of a rock shaft journaled in the holder at one side of the socket, a saddle embracing the holder and -hav-ing side arms mounted on the shaft to turn therewith, said side arms having transversely disposed heads and sockets in the heads, a tool retaining yoke in advance of the holder and having rearwardly extending arms slidable in the sockets, springs resisting the forward sliding movements of the arms, and a stop on the holder against which the portion of the yoke between the heads abuts.

7; The combination with a tool holder having a socket for the reception of a tool shank, of a saddle pivoted to and embracing the holder, and

a tool retaining yoke yieldingly mounted on the saddle and extending in advance of the holder.

GUSTAV C. PEARSON. 

